Chalk holder



FIG. 1 is a front perspective view of a chalk holder showing my new design, the three pieces of chalk depicted by means of broken lines being shown for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front view of the chalk holder of FIG. 1;

FIG. 3 is a right side view of the chalk holder of FIG. 1 and which is symmetrical to a left side view thereof;

FIG. 4 is a rear view of the chalk holder of FIG. 1;

FIG. 5 is a top view of the chalk holder of FIG. 1; and,

FIG. 6 is a bottom view of the chalk holder of FIG. 1. 

The ornamental design for a chalk holder, as shown and described. 